Thread: program that reads in a five-digit integer and determines whether or not it is a pali

program that reads in a five-digit integer and determines whether or not it is a palindrome

Code:

Enter a five-digit number ( -1 to end ): 18181
18181 is a palindrome

Enter a five-digit number ( -1 to end ): 16738
16738 is not a palindrome

Enter a five-digit number ( -1 to end ): -1

any one can help me on making this program?


i have make it but dont quite get...

this is my code that i have used

Code:

#include<stdio.h>
#include<string.h>

void main()
{
char strsrc[5];
char strtmp[5];

printf("\n Enter a five-digit number ( -1 to end ): "); gets(strsrc);

strcpy(strtmp,strsrc);
strrev(strtmp);

if(strcmp(strsrc,strtmp)==0)
printf("\n %s is a palindrome\n",strsrc);
else
printf("\n %s is not a palindrome\n",strsrc);
}

the program end after test 1 int, and -1 to end the program dont work

can any one help?

1. You can not fit a five-digit number into char strsrc[5]. The fact that gets allows you to get away with this is a failing of gets, which is why you shouldn't use that either.
2. If you want repetition, you must use some sort of structure that provides it (a "loop" of some kind).
3. Are you supposed to verify that they type a five-digit number and not "supercalifragilisticexpialidocious"?

the out put should come out something like this

Enter a five-digit number ( -1 to end ): 18181
18181 is a palindrome

Enter a five-digit number ( -1 to end ): 16738
16738 is not a palindrome

Enter a five-digit number ( -1 to end ): -1

- this program just can accept 5 integer
- can i use "int"?
- how do i make a loop? do you mind show some here?
- if using int how do i make it as revest? [strrev(strtmp);]

Originally Posted by StormRoBoT

- this program just can accept 5 integer

What?

- can i use "int"?

Certainly.

- how do i make a loop?

You read the section of your textbook that says "Loops". It's almost certainly at or before the section of your textbook that this problem came from.

- if using int how do i make it as revest? [strrev(strtmp);]

Usually, you use math to separate the digits, and then use math to reassemble them in a different order.

i still ot no idea on how to fix this.. sry very noob here... do you mind explane in detail..?

I would do this with math:

If your number is 12321 how do you single out the first digit?
How do you single out the last digit?

After you have singled out the first and last digit and compared them how do you move on to the next digits to compare?

Hint: the number 10, division, and modulus are important